Unloader valve



1,513,423 w. RAYMOND UNLOADER VALVl Filed Sept. 26. 1923 I, 3 l l [Il I I I f (l. Il'

` 42 W 39 nl 21 ,f 34 y INVENTQR.

A 33 'Walde/@ym A TTQRNEY.

Patented Oct. 28, 1924.

UlTED 1,513,423l ATENT OFFICE.

WARD RAYMOND, 0F EASTON, PENNSYLVANIA. ASSIGNOR T0 PENNSYLVANIA PUMP AND COMPRESSOR CO., OF EASTON, PENNSYLVANIA, A CORPORATION OIE PENNSYL- VANIA.

UNLOADER VALVE.

To all whom t 'may concern:

Be it known that I, WARD RAYMOND, a citizen of the United States, residing at Easton, in the county of Northampton and State of Pennsylvania, have invented certain new and useful Improvements in Unloader Valves, of which the following is a specification.

This invention relates to unloaders for compressors and in particular to an unloader adapted to operate by retaining one of the compressor valves in an open position during the unloaded period.

An object of the present invention is to provide improved means within the body member 0f the valve mechanism to hold the valve in its open position.

Also, it is an object to provide a piston operating within a cylinder formed Within a part of the valve mechanism, movement of the piston serving to force the valve to its open position through the medium of independent pins mounted Within the valve body.

Another object of the invention is to provide means to facilitate assembling the valve bodies in their positions relative to each other and to hold them in this assembled position while they are being placed in posiv tion within a compressor cylinder.

W ith these and other objects in View, my invention consists in the features of construction and operation set forth in the following specification and illustrated in the accompanying drawings.

In the accompanying drawings annexed hereto and forming a. part of this specification, I have shown my invention embodied in and forming a part of a compressor' valve mechanism but it will be understood that the drawing is not to be construed as defining or limiting the scope of the invention, the claims appended tol this specification being relied upon for that purpose.

In the accompanying drawing:

Figure 1 is a cross sectional view through the entire valve mechanism forming the. present invention.

Fig. l is a plan view of the valve body, onev half being shown with the cover plate broken away, and

Fig. 3 is a sectional view taken on line 3-3 of Fig. 1. y

In the above mentioned drawing, I have shown but one embodiment of the inven- Serial No. 664,943.

tion but it will be understood however that modifications may be made therein without departing from the spirit of the invention.

Briefly, my invention in its broadest aspect comprises the following principal parts: first, a valve body member such as that forming an inlet valve of a compresy sor; second, a cylinder preferably formed in a yoke member; third, a piston adapted to operate in the cylinder; fourth, means moved by said piston and engaging the valve to force it to its open position; fifth, fluid pressure means admitted to the cylinder to a-ctuate the piston; and sixth, means to temporarily retain the members forming the mechanism in assembled position while they are being placed in position within the cylinder.

Referring more in detail to the figures of the drawing at 10 is shown the Wall of a compressor cylinder having a cylinder head 11. Within spaces formed between the walls of the compressor is an intake passage 12 in which is located the intake valve body 13. It will be understood that several of these intake valves may be provided but as the invention is completely shown in one, the other intake valves and other parts of the compressor are not shown..

The valve body 13 may be of any type adapted for a valve plate such as shown at 14. Adjacent the valve body 13 is the cover plate 15, space being provided for movement of the valve plate 14 and for the fluid being compressed. To retain the body member 13 and cover plate 15 together, a bolt 16 is provided liavmg a. nut 17 threaded thereto.

The valve body 13 is forced against its seat formed within the cylinder walls by means of ay yoke'member 18, the periphery of which at one end engages the periphery of the valve body 13. Against the opposite end of the yoke member 18, a screw 2O is. adapted to bear. This screw 20 extends through a valve opening cover 21 adapted 'to be fastened in any desired manner to the cylinder walls 10. All of the above described means are or may be those usually found in. compressors of usual construction.

Formed within the valve body 13 are a plurality of parallel holes through which extend pins QQ.. Each of t-he pins 22 is formed with a head 23 on one end which may enter recessed portions of the holes. In order to normally force the pins 2Q- in` within the other so that the'pins 22 will be disposed to contact with both of the valve rings 14. Preferably three equally spaced loins 22 are provided in lposition to contarl with each of the valve rings 14.

Centrally within the yoke member 18 is provided a cylinder 25 within which may operate .a piston 26. At the inner end of the piston 26 is a grid member 27 preferably formed integrally with the piston 26. This grid 27 has two concentric portions 28 adapted to contact with the heads 23 of pins 22. Radially extending arms 29 provide supports for the rin s 28. From the above construction, it will e seen that movement of theV piston 26 `within its cylinder 25. will cause the rings28 to bear against the pins 22 so that pins 22 will force the valve rings 14 to their open position. A cup washer 30 fastened to the piston 26 provides a pressure .tight joint between the piston 26 and its c inder 25. A spring 31 disposed between t e nut 17 and an internal surface of the piston 26 normally forces the piston to a position retracted within its cylinder so that the valves 14 are free to operate.

'llo admit fluid pressure within the cylinder to force the piston 26 forward so that the valves 14 will be held from their seats, the following means are provided: Extendin through the end of the vyoke member is a ole 32 adjacent the retaining vscrew 20. Extending through the screw 20 in an axial direction is a hole 33 which is in alignment with the hole 32. Between the end surface of the yoke member 18 and the inner end of the screw 20 -is an annular gasket 34. By .admitting duid pressure throu h the hole 33 from a pressure regulating evice of any type, such as an auxiliary valve, the piston 26 may be forced to a position to hold the valves14 open. So long as/the valves 14 are open, no compression can take place at that end of the cylinder.

While the piston 26 is held in its normal l retracted position during which compresl advisable to prevent the lui sion takes places within the c linder, it -is the yoke member in place during, the assembling process. Screws of which two being coni-y rellenas or more may be provided are mounted radially within the yoke member 18. '.lhese screws may readily be adjusted manually so that their outer ends will contact with internal surfaces within the walls of the compressor. To aid in this particular, the outer ends of the screws are conically shaped so that they will easily engage the surfaces of the cylinder and upon being slightly tightened will retain the yoke member 18 and its attached parts in position. With these parts so retained in position, the cover plate 21 .may be fastened in place and the screw 2O tightened.

Additional retaining members ma be provided such as the screws 42 threads into the periphery of the valve body 13. rllhese screws 43, any number of which may be provided extending radially from the valve body 13, enter enlarged holes provided within the yoke member 18. With these screws 42 placed in position after the valve body 13 and yoke member have been assembled with the piston 26 and other parts in place, they are prevented from becoming disarranged and may readily be placed in proper position within the cylinder.

What ll claim is:

1. An unloading vdevice for compressors comprising in combination, a valve body adapted tobe inserted in the compressor, a .valve therein actuated during operation of the compressor, a yoke for supporting said valve body in position, a cylinder formed within said yoke, a piston movable therein, means to receive fluid pressure to move said piston, and means engaging the compressor walls to prevent separation of said valve body and yoke while the above mentioned parts are being placed in position.

2. An unloading device'for compressors comprising in combination, a valve body adapted to be inserted in the compressor, a valve therein actuated during operation of the compressor, a yoke for supportingsaid valve body in position, a cylinderY formed .within said yoke, a piston movable therein, means to receive Huid pressure to move said piston, and a plurality of radially extending screws threaded inthe valve body and loosep ly engaging the yoke whereby said valve body and yoke are prevented from separating while the above mentioned parts are being placedin position. i

3. An unloadingV device for compressors comprising in combination, a valve body adapted to be inserted in the compressor, a valve therein actuated during operation of Nthe compressor, a yoke for supporting said valve body in position, a cylinder formed within said yoke, a piston movable therein, vmeansto receiveI fluid pressure to move said piston, and means on said yoke adapted to engage portions of said compressor adjacent the valve opening to prevent separation of lll@ lllti said valve body and yoke while the above piston, and a plurality of radially extending mentioned parts are being placed in position. screws mounted in said yoke and adapted to 4. An unloading device for compressors engage portions of said compressor to precomprising in combination, a valve body vent separation of said valve body and yoke 5 adapted to be inserted in the compressor, a While the above mentioned parts are being valve therein actuated during operation of placed in position. the compressor, a yoke for supporting said In testimony whereof, I hereto aiix my valve body in position, a cylinder formed signature. Within said yoke, a piston movable therein, 10 means to receive Huid pressure to Inlove said WARD RAYMOND. 

